So let's say you breed a Woobat that has 3 perfect IVs - speed, attack and special defense. The man then names the three stats and then says something to the effect that in those areas your Woobat is perfect. If the Pokenon doesn't have perfect IVs, it takes the highest stats and sums them up similarly, but instead of saying they're perfect, he says something else.

Here's more info on the stats judge.